4. Solve the quadratic by factoring, isolating x^2, or using the quadratic formula:

a. 2x^2 - 7x = 4

b. 81x^4 - 1

c. 2x^2 - 32 = 0

d. X^2 - 7x + 12

Hello,

A:

2x²-7x-4=0

==>2x²-8x+x-4=0

==>2x (x-4) + 1 (x-4) = 0

==> (x-4) (2x+1) = 0

==> (x=4) or (x=-1/2)

B: where is the sign "="!

81x^-1 = (9x²+1) (3x+1) (3x-1) I can not go any further.

C)

2x²-32=0

==>x²-16=0

==> (x+4) (x-4) 0

==>x=-4 or x=4

D:

where is the sign "="!

x^2-7x+12 = (x-4) (x-3) but I can not go ant further ...