^=exponent
y^2=25
x^2-2x=4x+16
:eek:
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^=exponent
y^2=25
x^2-2x=4x+16
:eek:
Neither!
You have 2 unrelated equations.
From y^2 = 25 you get values of y
(Hint: if x^2 = 49, x = 7 or -7)
x^2-2x=4x+16
Becomes x^2 -6x -16 = 0
Which is a quadratic equations, which in this case can be solved by factorising, or
by the formula for quadratic equations.
Hint for factorising: Find 2 numbers (a and b) whose product is -16 and whose sum is -6.
Then factorising gives you (x -a) (x-b) = 0
from which you get 2 values of x: a and b.
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