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= (8a.5a) + (8a . - 11b) + (-17b . 5a ) + (-17b . -11b)
= 40 a² + (-88ab) + (-85ab) + 178b²
= 40 a² -173 b² + 178b²
b. 2 (4x + 5) . 5 ( 3x - 9)
= (8x + 10) . (15x - 45)
= (8x.15x) + (8x. -45) + (10. 15x ) + (10. - 45)
= 120 x² + (-360x) + 150x + (-450)
= 120x² - 210x - 450
c.-4 (3y - 11) . 8 (7y+2)
= (-12y + 44) . (56y + 16)
= (-12y.56y) + (-12y.16) + (44.56y) + ( 44.16)
= -672y² + (-192y) + 2464y + 704
= -672y² - 2272 7 + 704
=40a²-173ab+187b²
b.(8x+10) dikali (15x-45)
=120x²-280x+150x-450
=120x²-130x-450
c.(-12y+44) dikali (56y+16)
-672 y²-192y+2464y+704
=-672y²+2272y+704
2.a.(6z-12)+(3z+15)=9z+3
b.(13n-20)+(9n+20)=22n
c.(14k+8)+(7k+10)=21k+18