Question

if p(x) = x^2 +2x -15 has zeroes alpha and beta (a,b) then
ab(a+b) is equal to

PLEASE ANSWER FAST WITH FULL EXPLANATION

Answer 1

$hello \: mate$

Here, a=1, b=2, c= -15

We know that,

Sum of the zeroes (a+b)= -b/a= -2/1=-2

Product of the zeroes (ab)= c/a= -15/1=-15

Now,

➡ab(a+b)

➡ -15(-2)

➡30=>Answer

Answer 2

$x {}^{2} + 2x - 15 = 0 \\ x {}^{2} + 5x - 3x - 15 = 0 \\ x(x + 5) - 3(x + 5) = 0 \\ (x + 5)(x - 3) = 0 \\ x = - 5 \: and \: + 3 \\ \alpha = - 5 \: \beta = + 3 \\ ab(a + b) = ( - 5)(3)( - 5 + 3) \\ = - 15( - 2) \\ = + 30 \\ hope \: this \: helps \: you....$