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3. Write each of these expressions in the form p(x + q)² + r, where p, q and r are constants to be found:
a. 2x² + 8x + 1
b. 5x² - 15x + 3
c. 3x² + 2x - 1
d. 10 - 16x - 4x²
e. 2x - 8x² + 10


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