exam Maths Puzzle Numerical Ability

PLEASE HELP ASAP
In using mathematical induction to prove 8+10+12+...+(2n+6) = n^2+7n, the P k+1 statement is 8+10+12+...+(2k+6) = (k+1)+7(k+1)
Is this true or false
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exam Other Question

please help simplify x^2+2x/x^2+4x+4-x^2+x-2/x^2+4x+4 Solve the equation: 1n x = 1n 2 + 1n(3x-1)
I know the answer is 2/5 from the answers page.
I need to know how the solution was solved.
Thank you.