MCQ
If a = b then ax = ...........
- Ab + x
- Bbx
- Cb - x
- Db ÷ x
Solution:
Given, a = b Multiplying both sides by x.
ax = bx.
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$f(x)=\left\{\begin{array}{ll}-55 x, & \text { if } x<-5 \\ 2 x^{3}-3 x^{2}-120 x, & \text { if }-5 \leq x \leq 4 \\ 2 x^{3}-3 x^{2}-36 x-336, & \text { if } x>4\end{array}\right.$
Let $A=\{ x \in R : f$ is increasing $\} .$ Then $A$ is equal to :