Choose the equation that represents the solutions of 0 = 0.25x2 - 8x.
2 answers:
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Answer:
<h2>30 mm</h2>Step-by-step explanation:
The formula of an area of a circle:
<em>r</em><em> - radius</em>
<em />
We have
Substitute:
<em>divide both sides by π</em>
<em>use π ≈ 3.14</em>
The diameter <em>d = 2r</em>.
Therefore
Use the Difference of Two Squares Formula,
If x² = 4x², then x = √4x², x = 2x
If y² = 49, then y = √49, y = 7
We know both x and y, straight to formula.
Therefore, the factored form of 4x²-49 is (2x+7)(2x-7)