1) (3x+2)(5x+4)
= 3x × (5x+4) +2 × (5x+4)
= 15x^2 + 12x + 10x + 8
= 15x^2 + 22x + 8
2) (5x+3)(2x+8)
= 5x × (2x+8) + 3×(2x+8)
= 10x^2 + 45x + 6x + 24
= 10x^2 + 51x + 24
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1) (3x+2)(5x+4)
= 3x × (5x+4) +2 × (5x+4)
= 15x^2 + 12x + 10x + 8
= 15x^2 + 22x + 8
2) (5x+3)(2x+8)
= 5x × (2x+8) + 3×(2x+8)
= 10x^2 + 45x + 6x + 24
= 10x^2 + 51x + 24