Question

x2+2x-a equation zero value is 3 then what is a value​

Answer 1

$\huge\star{\underline{\mathtt{\red{A}\pink{N}\green{S}\blue{W}\purple{E}\orange{R}}}}⋆$

Hi there !!

Here's your answer

Given that ,

3 is one of the zero of the polynomial

x² + 2x - a

so,

x = 3

p(3) = (3)² + 2(3) - a = 0

9 + 6 - a = 0

-a = 0 - 15

-a = -15

a = 15

Thus,

the value of a is 15

Also,

we need to find the other zero

We have the polynomial

x² + 2x - 15

Factorising by splitting the middle term,

we have,

x² + 5x - 3x - 15

Taking out common factors,

we have,

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

Taking (x + 5) as a common factor,

we have,

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

x = 3 [ given ]and x = -5

So,

the other zero is -5

_______________________________

Hope it helps :-)

Answer 2

$\huge \mathcal {\fcolorbox{red}{gray}{\green{A}\pink{N}\orange{S}\purple{W}\red{E}\blue{R}{!}}}$

Given that ,

3 is one of the zero of the polynomial

x² + 2x - a

so,

x = 3

p(3) = (3)² + 2(3) - a = 0

9 + 6 - a = 0

-a = 0 - 15

-a = -15

a = 15

Thus,

the value of a is 15

Also,

we need to find the other zero

We have the polynomial

x² + 2x - 15

Factorising by splitting the middle term,

we have,

x² + 5x - 3x - 15

Taking out common factors,

we have,

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

Taking (x + 5) as a common factor,

we have,

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

x = 3 [ given ]and x = -5

So,

the other zero is -5

_______________________________

HOPE SO IT WILL HELP......