Consider the expression: 9a^3b^6(3a^3b^2+7a^2b2)-(5a^4b^4)^2 Select the equivalent expression in standard form:

x^2 + 81

we can factor this using difference of square binomials.

rewrite the equation:

x^2 - (-81)

factor:

(a^2 - b^2) = (√a^2 + √b^2)(√a^2 - √b^2)

(x^2 - (-81) = (x + √-81)(x - √-81)

we can remove the - from under the radical by multiplying it by i.

(x^2 - (-81) = (x + i√81)(x - i√81)

(x^2 - (-81) = (x + 9i)(x - 9i)

we can check our answer by using foil:

x^2 - 9ix + 9ix - 81i^2

x^2 - 81^2

i^2 = -1

x^2 + 81

answer: given the scale 3,5 mm to 1 foot: so you know this and you need convert this 150mm to get the right answer.

0.2cm < 1.5cm : 0.2cm > 1.5cm