Find the value of this expression if x = 1 and
y=-7.
xy
-9

the answer is 7/9

given..

expression is x^2y/-9

value of x=1

value of y=-7

then putting value of x and y in the given equation...

we get .

={1^2*(-7)}/-9

={1*(-7)}/-9

=(-7)/-9

=7/9

nope

step-by-step explanation:

x = ±sqrt(10)

step-by-step explanation:

5 - 2x² = -15

subtract 5 from each side

5-5 - 2x² = -15-5

-2x^2   = -20

divide by -2 on each side

-2x^2   /-2= -20/-2

x^2 =10

take the square root on each side

sqrt(x^2 )=±sqrt(10)

x = ±sqrt(10)

check:

5 - 2x² = -15

+sqrt(10)

5 - 2(sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15

-sqrt(10)

5 - 2(-sqrt(10))² = -15

5 -2(10) = -15

5 -20 = -15

-15 = -15