Answer: 3x^2-30x+5
Step-by-step explanation:
Use (a+b)^2=a^2-2ab^2+b2
3(x^2-10x+25)-70
Distribute the 3 which is
3x^2-30x+75-70
Subtract the numbers {75-70} and simplify
3x^2-30x+5
