exam Maths Puzzle Numerical Ability

How do you write and the f(x)=(x+5)(2x-9) equation in to standard form?

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exam Other Question

Solve:

5/3x = 4/5 + x Polynomial ax^3+ bx^2+cx+d has integral coefficients a,b,c,d. ad is odd and bc is even.
PROVE THAT at least 1 root of the polynomial is irrational

I used sum of roots and produ