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Simplifying x2 + -4y2 = 21 Solving x2 + -4y2 = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4y2' to each side of the equation. x2 + -4y2 + 4y2 = 21 + 4y2 Combine like terms: -4y2 + 4y2 = 0 x2 + 0 = 21 + 4y2 x2 = 21 + 4y2 Simplifying x2 = 21 + 4y2 Reorder the terms: -21 + x2 + -4y2 = 21 + 4y2 + -21 + -4y2 Reorder the terms: -21 + x2 + -4y2 = 21 + -21 + 4y2 + -4y2 Combine like terms: 21 + -21 = 0 -21 + x2 + -4y2 = 0 + 4y2 + -4y2 -21 + x2 + -4y2 = 4y2 + -4y2 Combine like terms: 4y2 + -4y2 = 0 -21 + x2 + -4y2 = 0 The solution to this equation could not be determined.
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