Does anybody know any of these questions, please?...

1)Mandy is x years old

Her brother is 5 years older than Mandy

The product of their ages is 84

Show that x^2 + 5x - 84 = 0

(^2 meaning x "squared")

2)Solve the simultaneous equations

y=x+2

y=3x^2 (^2 meaning x "squared")

you must show your working out

Donotuse a trial and improvement method.

Thanks any help would be appreciated!