Answer:
You add them together
Step-by-step explanation:
The answer to all of those questions would be x=-1.8
7x(x + 1.8) = 0 - Distribute through the Parenthesis -
7x^2 + 12.6x = 0
x(7x + 12.6) = 0
x = 0
7x + 12.6 = 0
7x = -12.6
x = -12.6/7
x = -1.8
so x = 0 or x = -1.8
cubic quadratic linear quadratic. first 4 rest i dunno
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