Question

Find the value of the following expression when x = -3
a)
(5x – 4)2
(Ans. 361)
b) -7x2 + 8
(Ans. - 55)
step by step plZ​

Answer 1

Answer:

value of x is (-3),

so substituting the value of x in expressions

A.(5x-4)2

= {5(-3)-4}2

={-15-4}2

=(-19)2

squaring (-19) gives us 361.

B.(-7x)2+8

=(-7*-3)2+8

=(21)*2+8

=42+8

=50