proszę obliczyć: a ) (a+1) (a-1) b ) (x-15) (x-1) c) (4+x) (x-8) d ) (3a-2b) (a+b) e) 2(b-3c) (b+3c) BARDZO PROSZĘ O POMOC !!!!
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b) x^2-16x+1
c) x^2 -4x - 32
d) 3a^2+ab-2b^2
e) 2b^2-18c^2
f) 5a^3-5a^2b+5ab^2+5b^3
a ) (a+1) (a-1) = a²-1
b ) (x-15) (x-1) = x²-x-15x+15 = x²-16x +15
c) (4+x) (x-8) = 4x - 32 + x² - 8x = x² - 4x -32
d ) (3a-2b) (a+b) = 3a² +3ab -2ab -2b² = 3a² + ab - 2b²
e) 2(b-3c) (b+3c) = 2(b²-9c²) = 2b² - 18c²