exam Maths Puzzle Numerical Ability

Can someone please help?

Solve 3x^2-5x-7=0
Find x intercepts of f(x)=3x^2-5x-7

Thanks.

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exam Other Question

CAN YOU TELL ME IF 25 IS A RATIONAL NUMBER Solve the following equation for the unknown:

1) 6.2(x - 15.1) = 9.3(-x - 3.2)