Evaluate
4d^{2}-14df+14f^{2}
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4d^{2}-14df+14f^{2}
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4d^{2}-20df+2f\left(3d+7f\right)
Use the distributive property to multiply 4d by d-5f.
4d^{2}-20df+6fd+14f^{2}
Use the distributive property to multiply 2f by 3d+7f.
4d^{2}-14df+14f^{2}
Combine -20df and 6fd to get -14df.
4d^{2}-20df+2f\left(3d+7f\right)
Use the distributive property to multiply 4d by d-5f.
4d^{2}-20df+6fd+14f^{2}
Use the distributive property to multiply 2f by 3d+7f.
4d^{2}-14df+14f^{2}
Combine -20df and 6fd to get -14df.
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