Answer:
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Step-by-step explanation:
(i) 16a^2=2√a
Square both sides.
256a^4=4a
Then solve.
a=0,a=1/4
(ii) b^4+7b^2-18=0
Rewrite the equation with u=b^2 and u^2=b^4.
u^2+7u-18=0
Solve.
u=2, u=-9
Substitute back u=b^2. Solve for b.
b=√2, b=-√2, b=3i, b=-3i
-hope it helps?
(I'm still new to this subject so I might have it incorrect)
