Question

Find the value of:

a) (5x) - 3, where x = -2/5

b) (-ab) + 2, where a = 2 and b= - 1​

Answer 1

Answer:

Correct option is

D

−73

Given: α,β are zeroes of the polynomial 4x2+3x+7

To find the value of α1+β1

We know that equation ax2+bx+c=0

Then sum of roots =a−b and product of roots=ac

From the given quadratic equation,

α+β=−43 and αβ=47

Therefore, 

α1+β1=αβα+β

=47−43=−73

⇒α1+β1=−73

Answer 2

1. 5×(-2/5)-3= -10/5-3
2. = -2-3
3. =-5 Ans.