Question

Find the product for these questions  1.( 2x ) ( 10x ) 2.  -3m( m + 8 ) 3. 4d( 2d -9 ) 4. ( 3x + 4 ) ( x -2 ) 5. ( 2y -1 ) ( 4y - 3 )

Answer 1

 1.( 2x ) ( 10x ) = 20 x²

2.  -3m( m + 8 ) = -3m² - 24m

3. 4d( 2d -9 ) = 8d² - 36d

4. ( 3x + 4 ) ( x -2 ) = 3x² - 6x + 4x - 8 = 3x² - 2x -8

5. ( 2y -1 ) ( 4y - 3 ) = 8y² - 6y - 4y + 3 = 8y² -10y +3

Answer 2

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 :
$a(b+c) = (a \times b)+(a \times c)$

$(a+b)(c+d)=(a \times c)+(a \times d)+(b \times c)+(b \times d)$