3 years ago

Simplify: (−7a − 19c) − (−12a + 30c) − (−21a − 11c)

2 answers:

8 0

(−7a − 19c) − (−12a + 30c) − (−21a − 11c)

= −7a − 19c + 12a - 30c + 21a + 11c

= (-7a + 12a + 21a) + (11c - 19c - 30c)

= 26a - 38c

= 2(13a - 19c)

statuscvo [17]3 years ago

6 0

2*(13a-19c) hope that helps for you

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frosja888 [35]

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Hope this helps!

Step-by-step explanation:

ΔABC is a 45°, 45°, 90° triangle. The longest side ( 6 $\sqrt{2}$ ) can be $x\sqrt{2}$ while AB and CB are x. Because 6 $\sqrt{2}$ is equal to $x\sqrt{2}$ , you can see that x is equal to 6. Both AB and CB are equal to 6. ΔBDC ( CDB ) is a right triangle ( 30°, 60°, 90° ) so, BD = x, CB = 2x, and CD = $x\sqrt{3}$ . CB is equal to 6 so 2x = 6, x = 3.