Question Factor the expression 21(x−4) Evaluate 21x−2Solution 21(x−4) Show Solution Find the roots x=4 Evaluate 21x−2To find the roots of the expression,set the expression equal to 0 21x−2=0Move the constant to the right-hand side and change its sign 21x=0+2Removing 0 doesn't change the value,so remove it from the expression 21x=2Multiply by the reciprocal 21x×2=2×2Multiply x=2×2Solution x=4 Show Solution
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