Question
If $\mathrm{a}, \mathrm{b}, \mathrm{c}$ are in $\mathrm{AP}$, then $4\left(\mathrm{~b}^{2}-\mathrm{ac}\right)=$(a) $a^{2} c+3$(b) $\frac{\mathrm{a}+\mathrm{c}}{2}$(c) $\frac{(a+c) a}{3}$(d) $(\mathrm{a}-\mathrm{c})^{2}$
Step 1
That is, $b = \frac{a+c}{2}$. Show more…
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