Which of the following is equivalent to (-7x^3+5ax-3) + (7x^3+5-9ax)?
A. 14x^3 - 4ax + 2
B. x^6 - 4ax + 2
C. -4ax + 2
D. -49x^3 - 45ax - 15
2 Answers | Add Yours
(-7x^3+5ax-3) + (7x^3+5-9ax) ---- (multiply the equation on the right by (+). Step 1.
-7x^3+5ax-3 + 7x^3+5-9ax ------ (-7x^3+7x^3=0).Step 2.
5ax-3+5-9ax ---- (5ax-9ax=-4ax).Step 3.
-4ax-3+5 --- (-3+5=2). Step 4.
-4ax+2. Step 5.
"C" is the right the equivalent equation for (-7x^3+5ax-3) + (7x^3+5-9ax). I hope my explainations helped you to understand :). Feel free to message me for anymore questions.
The question involves direct addition of terms that are alike.
(-7x^3+5ax-3) + (7x^3+5-9ax)
Open the brackets
-7x^3 + 5ax - 3 + 7x^3 + 5 - 9ax
Take the alike terms together
=> -7x^3 + 7x^3 + 5ax - 9ax - 3 + 5
=> 0 - 4ax + 2
The required result is -4ax + 2, which is option C.
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