If D = 1- x2 and C =-1- 3x2 + 4x, find an expression that equals 3D -3C in standard form.

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A: Given  12 + 22 + 32 + ⋅ ⋅ ⋅ + n2 = n(n+1)(2n+1)6Step 1   P(1) is true             P(1) = I2 = 1   ⇒…