To solve the quadratic equation \( 7x^2 = 56x \), we first need to rearrange it into standard form:
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Move all terms to one side: \[ 7x^2 - 56x = 0 \]
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Next, factor out the greatest common factor (GCF), which is \( 7x \): \[ 7x(x - 8) = 0 \]
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Set each factor equal to zero: \[ 7x = 0 \quad \text{and} \quad x - 8 = 0 \]
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Solve for \( x \):
- From \( 7x = 0 \), we get \( x = 0 \).
- From \( x - 8 = 0 \), we get \( x = 8 \).
Thus, the solutions are \( x = 0 \) and \( x = 8 \).
Looking at the provided options:
- Option A incorrectly states the solutions as \( x = -7 \) and \( x = 8 \).
- Option B incorrectly begins with \( 7x^2 + 56x = 0 \) and gives incorrect solutions \( x = -8 \) and \( x = 0 \).
- Option C correctly puts the quadratic in standard form, factors it accurately, and gives mistaken solutions \( x = 0 \) and \( x = 8 \) (the correct solutions are fine, but the format is less informative).
- Option D correctly describes the steps and keeps the notation clear, providing the correct solutions \( x = 0 \) and \( x = 8 \).
- The last option incorrectly states that there is no GCF.
The correct answer, in terms of clarity and accuracy with all steps shown, is Option D.