Answer:
x² + 6x - 5x – 30=(x-5)(x+6)
Step-by-step explanation:
x² + 6x - 5x – 30=x²+x-30
delta=1-4(-30)=1+120=121=11²
Sqrt(delta)=11
The roots are:
x1,2=(-1 +- 11)/2
Thus we get
x1=(-1+11)/2=10/2=5
x2=(-1-11)/2=-12/2=-6
Finally:
x² + 6x - 5x – 30=(x-5)(x+6)
Answer:
hmmm it would be 10x15
I hope it helped, I'm very sorry if it was wrong
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- unknown friend
Answer:
A. 90 sq. units
Step-by-step explanation:
5(18) = 90
Answer:
n = 3
Step-by-step explanation:
start by combining 'like' terms on each side of equation to get:
7n - 9 = -3n + 21
add 3n to each side to get:
10n - 9 = 21
add 9 to each side to get:
10n = 30
n = 30/10 or n = 3
Check:
7(3) - 9 = -3(3) + 21
21 - 9 = -9 + 21
12 = 12