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Simplifying (x + 3y)(x + -3y) = 7 Multiply (x + 3y) * (x + -3y) (x(x + -3y) + 3y * (x + -3y)) = 7 ((x * x + -3y * x) + 3y * (x + -3y)) = 7 Reorder the terms: ((-3xy + x2) + 3y * (x + -3y)) = 7 ((-3xy + x2) + 3y * (x + -3y)) = 7 (-3xy + x2 + (x * 3y + -3y * 3y)) = 7 (-3xy + x2 + (3xy + -9y2)) = 7 Reorder the terms: (-3xy + 3xy + x2 + -9y2) = 7 Combine like terms: -3xy + 3xy = 0 (0 + x2 + -9y2) = 7 (x2 + -9y2) = 7 Solving x2 + -9y2 = 7 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9y2' to each side of the equation. x2 + -9y2 + 9y2 = 7 + 9y2 Combine like terms: -9y2 + 9y2 = 0 x2 + 0 = 7 + 9y2 x2 = 7 + 9y2 Simplifying x2 = 7 + 9y2 Reorder the terms: -7 + x2 + -9y2 = 7 + 9y2 + -7 + -9y2 Reorder the terms: -7 + x2 + -9y2 = 7 + -7 + 9y2 + -9y2 Combine like terms: 7 + -7 = 0 -7 + x2 + -9y2 = 0 + 9y2 + -9y2 -7 + x2 + -9y2 = 9y2 + -9y2 Combine like terms: 9y2 + -9y2 = 0 -7 + x2 + -9y2 = 0 The solution to this equation could not be determined.
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