exam Maths Puzzle Numerical Ability

how do i find the LCD for rational expressions and convert each rational expression into an equivalent rational expression w/LCD as the denominator

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exam Other Question

Find any rational roots for the equation

x to the fourth + 3x squared -8x + 10 = 0
1) y=x
y=-x

2)y=-x
y=x+9

i have 12 problems just like this, and the instuctions
in the book i dont get. pleezzz help thank you