16-9p^4c^2=?a^2-25y^2=?(3x+5)×(4x-5)-2x(2,5+1,5x)=?решите плиз

Question

16-9p^4c^2=?
a^2-25y^2=?
(3x+5)×(4x-5)-2x(2,5+1,5x)=?
решите плиз

Answer 1

16-9p⁴c² = (4-3p²c)(4+3p²c)
a²-25y² = (a-5y)(a+5y)
(3x+5)(4x-5)-2x(2,5+1,5x) = (3x+5)(4x-5)-2x*0,5(5+3x) = (3x+5)(4x-5-x) = (3x+5)(3x-5) = 9x²-25