Question: Which of the following pairs represents the zeroes of the polynomial x2 + 2x - 15?

Posted by: Santosh.s on 08.08.2017

x^2+2x-15=0

x^2+5x-3x-15=0

x(x+5)-3(x+5)=0

(x+5)(x-3)=0

(x+5)=0   or (x-3)=0

x=-5     or x=3

zeros (3,-5)

By solving it by formula We get zeroes = -5, 3

Apologies for posting the different answer here. Accidentally it got happen. Kindly consider this solution:

x^2+2x-15

use splitting the middle term:

x^2+(5x-3x)-15

x(x+5)-3(x+5)

(x+5)(x-3)

Steps are mentioned below:

• Install python on your computer
• open terminal
• change directory to the location where file is located
• use this command : python filename.py

X^2+2x-15 =x^2+(5-3)x-15 =x^2+5x-3x-15 =x(x+5)-3(x+5) =(x+5)(x-3) Therefore roots of the polynomial are either (x+5)=0 or(x-3)=0. Therefore roots are -5 and 3.

Zeroes of polynomial means the roots of polynomial.

X^2 + 2X-15

X^2 + (5-3)X - 15

X^2 + 5X - 3X - 15

X(X+5) -3(X+5)

(X+5) (X-3)

Therefore the roots are -5 and 3

Zeroes of a polynomial means roots of the polynomial

By splitting midle term, given polynomial = (x+5) (x-3)

Therefore roots are 3 and -5

x^2+2x-15 = x^2+5x -3x-15 = x(x+5)-3(x+5) = (x+5)(x-3)

therefore the zeros of the polynomial are 3, -5

Hence option 4 is the correct ans.

= x2 + 2x - 15

= x2 + 5x - 3x -15

= x(x+5) -3(x+5)

= (x+5)(x-3)

Therefore zeroes are x+5 = 0 or x - 3 = 0

-5 and 3 are the zeroes of the given expression

x^2 + 2x - 15 = 0 x^2 + 5x - 3x - 15 = 0 x(x + 5) - 3(x + 5) = 0 (x - 3)(x + 5) = 0 Hence, zeroes of the polynomial = 3, -5 Option 4 is correct.

-5 and 3 because x^2 +5x-3x -15 = (x+5)(x-3)
See students The polynomial given is x^2 + 2*x + 15 Equating the polynomial with zero gives x^2 + 2*x + 15=0 There are 2 approaches x^2 + (5*x) - (3*x) + 15 =0 x*(x-5)-3*(x-5)=0 x=(5,3) 2nd method X=(b+/- sqrt(b^2 - 4*@*c))/2*a
X^2+ 5x-3x-15=0 so, x= 3,-5
X2 + 2x - 15=0 x2+ 5x -3x - 15 = 0 x= -5, 3 ans
Answer : 4 (3,-5) Because +5 and -3 are the factors. Hence the pair (3,-5) represent the zeros of the polynomial x2+2x-15

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