3.express x² = 8x in standard form A.x²-8x-0
B.ax²-8x=0
C.x²+8x=0
D.x²+8x-0
6.express 5x²+8x=-2 in standard form
A.5x²+8x-2=0
B.5x²-8x+2=0
C.5x²-8x-2=0
D.5x²+8x+2=0
10.in the quadratic equation ax²+bx+c=0,ax²,bx is the
11.find the product of (2x+9)(2x-9)
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answer:
3.c
6.d
10.c= -a²- bx, a€ R , b€R ,x€R
step-by-step;
a²+bx+c=
↓
move the expression to the right-hand side and change its sign
c=-a² - bx
↓
write the solution C in parametric
c= -a² -bx ,a€R,b€R,c€R