Question Factor the expression 4(a−21) Evaluate 4a−84Solution 4(a−21) Show Solution Find the roots a=21 Evaluate 4a−84To find the roots of the expression,set the expression equal to 0 4a−84=0Move the constant to the right-hand side and change its sign 4a=0+84Removing 0 doesn't change the value,so remove it from the expression 4a=84Divide both sides 44a=484Divide the numbers a=484Solution More Steps Evaluate 484Reduce the numbers 121Calculate 21 a=21 Show Solution
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