Question

solve using the perfect square factoring patterns: y^2 + 18y + 81 = 0

Answer 1

y^2 +18y +81 = 0

Again rudimentary knowledge of time tables should tell you we're dealing with the number 9.

9+9 = 18, 9*9 = 81

The equation says +18y and +81 so clearly the sign has to be positive.

(y+9)^2 = 0

(y+9) = square root of 0

Ok this is going to break with normal quadratic equations as it will only have one solution, when we square root zero, we get +ve 0 and -ve 0 but they both mean zero.

(y+9) = 0

y= -9

Answer 2

answers
a)9
b)9, -9
c)-9
d)0, -1

Answer 3

ok thank you

Answer 4

Anytime