Solution 1 :
\((2x)(10x)\)
\(\boxed{= 20x^{2}}\)
Solution 2 :
\(-3m(m+8)\)
\(\boxed{= -3m^{2} - 24m}\)
Solution 3 :
\(4d(2d-9)\)
\(\boxed{= 8d^{2} -36d}\)
Solution 4 :
\((3x+4)(x-2)\)
\(= 3x^{2} - 6x + 4x - 8\)
\(\boxed{= 3x^{2} - 2x - 8}\)
Solution 5 :
\((2y-1)(4y-3)\)
\(= 8y^{2} -6y -4y + 3\)
\(\boxed{= 8y^{2} -10y + 3}\)
Note :
Remember this formulas :
\(a(b+c) = (a \times b)+(a \times c)\)
\((a+b)(c+d)=(a \times c)+(a \times d)+(b \times c)+(b \times d)\)
