Question Simplify the expression 8970−21d Evaluate 9600−2412d−630Cancel out the common factor 12 9600−21d−630Solution 8970−21d Show Solution Factor the expression 21(17940−d) Evaluate 9600−2412d−630Cancel out the common factor 12 9600−21d−630Subtract the numbers 8970−21dSolution 21(17940−d) Show Solution Find the roots d=17940 Evaluate 9600−2412d−630To find the roots of the expression,set the expression equal to 0 9600−2412d−630=0Cancel out the common factor 12 9600−21d−630=0Subtract the numbers 8970−21d=0Move the constant to the right-hand side and change its sign −21d=0−8970Removing 0 doesn't change the value,so remove it from the expression −21d=−8970Change the signs on both sides of the equation 21d=8970Multiply by the reciprocal 21d×2=8970×2Multiply d=8970×2Solution d=17940 Show Solution