Y^2 + y - 72 factorise

y² + y - 72

= y² + 9y - 8y - 72

= y(y + 9) - 8(y + 9)

= (y - 8)(y + 9)

Step-by-step explanation:

(y + 9) (y - 8)

Step-by-step explanation:

y² + y - 72

= y² + 9y - 8y - 72

= y (y + 9) - 8 (y + 9)

= (y + 9) (y - 8)

Hope it helps :)

Please mark my answer as the brainliest

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

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