Answer: 1. 16a2−49
4a−7)(4a+7)
=(4a+−7)(4a+7)
=(4a)(4a)+(4a)(7)+(−7)(4a)+(−7)(7)
=16a2+28a−28a−49
=16a2−49
2. (8b+11)(8b−11)
=(8b+11)(8b+−11)
=(8b)(8b)+(8b)(−11)+(11)(8b)+(11)(−11)
=64b2−88b+88b−121
=64b2−121
3. 81c2−16d2 (MENTAL ANSWER)
4. 25d2−1064.024078
5. (10f+3gh)(10f−3gh)
=(10f+3gh)(10f+−3gh)
=(10f)(10f)+(10f)(−3gh)+(3gh)(10f)+(3gh)(−3gh)
=100f2−30fgh+30fgh−9g2h2
=−9g^2h^2+100f^2
Thats all i know (PLZZZZZZZ DONT REPORT IT IS TOOO HARD TO ANSWER :( ) mark this from brainliest
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Answer: 1. 16a2−49
4a−7)(4a+7)
=(4a+−7)(4a+7)
=(4a)(4a)+(4a)(7)+(−7)(4a)+(−7)(7)
=16a2+28a−28a−49
=16a2−49
2. (8b+11)(8b−11)
=(8b+11)(8b+−11)
=(8b)(8b)+(8b)(−11)+(11)(8b)+(11)(−11)
=64b2−88b+88b−121
=64b2−121
3. 81c2−16d2 (MENTAL ANSWER)
4. 25d2−1064.024078
5. (10f+3gh)(10f−3gh)
=(10f+3gh)(10f+−3gh)
=(10f)(10f)+(10f)(−3gh)+(3gh)(10f)+(3gh)(−3gh)
=100f2−30fgh+30fgh−9g2h2
=−9g^2h^2+100f^2
Thats all i know (PLZZZZZZZ DONT REPORT IT IS TOOO HARD TO ANSWER :( ) mark this from brainliest