x2 - 10x + 25 = 64 Or x2 - 10x + 25 = 64?
If the first, move all over to 1 side; x2 - 10x + 25 - 64 = 0
x2 - 10x + -39 = 0
Then make it into quadratic equations; (x - 13)(x + 3) = 0
Therefore x = 13 or x = -3.
If the second, 8x = -39
-39/8 = -9.75 = x
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x=-.25.
4a + a = 25 add 4a and a 5a = 25 then divide 25 by 5 a = 5
x = 25 / 3squared + 5
-5x+50 = 25 -5x = 25-50 -5x = -25 x = 5
5n+15 = 25 5n = 25-15 5n = 10 n = 2