Answer:
3 x^3 * y^4*√(5x)
Step-by-step explanation:
Factor
45: 3 * 3 * 5
y^8 = y * y * y * y *y * y * y * y
x^7 = x *x *x *x *x *x *x
Now underline every pair.
Rule: for every pair, take 1 outside the square root sign and throw the other one away. If any of the bases are left over, leave them under the square root sign.
3 * y * y * y * y * x * x * x * √ (5 * y)
Answer: 3 x^3 * y^4*√(5x)
