. If 5x2 + 7x = 6, which statement is correct? A) x = 2 or x = 3/5 B) x = –2 or x = 3/5 C) x = 2 or x = – 3/5 D) x = –2 or x = -
3/5
1 answer:
I'm assuming you are asking 5x^2+7x = 6, and not 5*2 +7x = 6
We would use the quadratic formula to solve this.
5x^2+7x-6
(-7+-sqrt(7^2-4*5*-6))/2*5
(-7+-sqrt(49+120)/10
(-7+-sqrt(169)/10
(-7+-13)/10
-20/10=-2
6/10=3/5
So the answer is B) <span>x = –2 or x = 3/5</span>
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Step-by-step explanation:
The rule for a 90 degree counterclockwise is
(x,y) -> (-y,x)
so
C(-1,2) -> C'(-2,-1)
D(3,5) -> D'(-5,3)
E(1,2) -> E'(-2,1)
F(x)=x-3 I think but I am not sure
Answer:
a.

b.

The value of the number is 80,000