6x^3+root2x^2-10x -4 root 2 when root 2 is one of the zero
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f(x) = 6x³ + √2x² - 4√2
f(√2) = 6 (√2)³ + √2(√2)² - 4√2
= 6 ×2√2 + √2 × 2 - 4√2
= 12√2 + 2√2 - 4√2
= 10√2.
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