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Anonymous
6y3 + 8y2 - 15y - 20 is an expression, not an equation (or inequality). An expression cannot be solved.
The expression factorises to (3y + 4)*(2y2 - 5)
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Prime factor both numbers or expressions and use the factors the number of times it was used the MOST in either number. 6y^3=2*3*y*y*y 18y^4=2*3*3*y*y*y*y 2*3*3*y*y*y*y=18y^4