$7-8)$ For the following functions,

$($a$)$ Count the number of multiplications and additions needed using simple order of operations.

$($b$)$ Find a more efficient method of evaluating the polynomial by storing and reusing intermediate powers of the variable. Count the number of multiplications and additions needed. Don't use Reduction to Horner's method here, just use storing and reusing intermediate powers.

$P(x)=2-5x^2+7x^3-8x^4$

$P(x)=-3+6x^2+2x^3-7x^6$